1. APV Readout Controllers DAQ
by Mikko Nykänen

2. Topic I try explain mainpoints of reading APV25-S1 chip in DAQ
At begining I tell whole structure of DAQ, parts, main purpose and functions
But main topic is APV chip and how we can adjust the timing in DAQ
In APV we go through components, how much time is spend and what we can change in registers
We also go throught little how we can change APV settings, mainly how mode affects to DAQ

3. ARCS Parts Control computer, with ISA Bus + PCMIO interface ARC Board
Power +5V(1.5A) / -5V(0.15A)
2 x FE Adapters
2 x APV25-S1 chips
Cables 50 pin, 2x20pin, and 2 APV and power cables

4. ARC Board Rate 20/40MHz 6 Channels Resolution 8bit
Memory 8K x 8bit per channel
External (NIM) or Internal trigger (software)
Internal clock 40MHz or External up to 40MHz
Expansion port
Clock, trigger, synchronised trigger and APV trigger

5. Hybrid I/O
6 differential voltage -> 6 APVs in one port
50 Ohms resistance
3 Standard Buffered I2C
2 LVDS clock and 2 LVDS trigger lines
Dimensions
19” crate or Double Euro Format

6. ARC – Block diagram Trigger&Clock Group 1&2
Local crystal oscillator, software/external trigger -> synchronised to system clock
Trigger is distributed via link or missing clock pulses
Group 1&2
2 groups of 3x8bit FADC
For correct sample timing ->tune FADC clock 0-10x1.7ns
Data is stored in 8Kbyte RAM in each channel
Data lenght

7. Slow control LV control 2xI2C controller Hydrids powered by FE boards
On/off switch if nessacery
Hybrid currents are monitored by third I2C control

8. Address
By using address via PCMIO you can read or write data in board or in APV
Next colum tells what you can see in address
Status register
Write DAC/ Read RAM
Write memory/soft trigger
Write APV trigger data
Slow control
ADC clock delay
Write stop address
Write RAM data

9. Software ARC use LabView program Userfriedly program and easy to use
But to main point in this prensentation
DAQ
For timing is the ADC clocks value important
In APV register you can also change timing by changing latency
But most important thing in DAQ is what is the mode in APV

10. APV25 Register
In program you can change preamplifier, sharperer, bias current and few other values
Latency is one of the value here
E.g if you put latency to 132 you get 3.3us delay
Mode
Defines how APV behaves alltogether

11. Mode selection
Basically you put value to mode and you are happy, not quite
Mode number is based on 6bit number and when you select in table what you want to APV to do we calculate the numerical value

12. Mode register This picture is from APV user guide 2.2
So you select how the measurements are done and then put the to mode

13. APV25-S1 Analogue pipeline ASIC
Idea is to process data prior to sending it
APV chip has following parts: preamplifier, sharper, 192 column analogue memory(buffer)
When APV collects data to buffer it can keep history of earlier events. In one channel there is data for last 4us period in pipeline. (25ns x192)
Sharper and preamplifier use 50ns

15. Main point in APV is the buffer
Main point in APV is the buffer. Data in there does not over write we make flag that is ready -> timing should be easy
APV is ready to take data around every 5-6us
This makes the chip dead-timeless, so even fast it can collect events quite efficient

16. Timing In software you can change two values.
1. is the latency in APV register(chip)
2. is the ADC clock, is used to fine tuning DAQ
You should keep mind that when the trigger signal comes the DAQ starts after 70/35 clock pulse around us
System clock 40MHz -> 25ns
Delays from cables is not taken account

17. Times ADC clock 0-17ns APV register: Latency
You can change this on fly and you can seek best position to collect data from screen
Can be changed by moving the lever in ARCS software
APV register: Latency
Here you cant go over value 160 in settings
Input value in APV register, latency
Value 0 to reasonable 132, 0-3.3us delay

18. Few words We went through main points
Soon I do better one presentation/ document and there I include more exact data and calculations
Final goal is to make manual, how to build this system and how to use it.
What tests does
How settings affect to results
But programs manual does this also so have to think different approach->to maybe find a way optimace latencys and delays
Give working test setup and good manuam with it